chicago



G. A. BUHL.

METHOD 0F OBTAINING SOLID SUBSIANCES FROM SOLUTIONS CARRYING TIIE SAME.

` APPLICATIoN FILED IMI/8.1915.

' drawing,

narran erases namens ernten GEORGE ARTHUR BUHL, OF CHICAGO, ILLINOIS, ASSIGNOR TOTHE G. A. BUHL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

METHOD 0F OBTAINING' SOLID SUBSTNCES FROM SOLUTIONS CARRYING THE SAME.

To all 'whom t 'may concern:

Be it known that I, GEORGE ARTHUR BUHL, a citizenv ofthe United States, residing at Chicago, in the county of Cook and have-invented new and usein Methods of Obtaining Solid Substances from Solutions Carrying the Same, of which the following is a specification.

'My invention relates to improvements in methods of obtaining solid substances from solutions carrying the same, and is more particularly described -in the following detailed speciication. reference willbe had to the accompanying which shows schematically one form of apparatus adapted for carrying'out my process.

In the drawing,the numeral 1 designates a supply tank containing a solution 2 of the solids which are to be freed from the solvent. From the supply tank 1 a pipe 3 leads to a liquid pump 4, and from the latter a pressure pipe 5 conductsthe solution 2. to a heating coil 6, which ispreferably mounted within a heating chamber 7. The

chamber 7 may conveniently be heated byfluid under pressure, as by. steam which may be supplied from a pipe 8, the water of condensation or exhaust steam passing lout of the box or heating chamber by a pipe 9.

At the end of the heating coil 6 there is provided ka nozzle 10, whichdischarges into the expansion chamber 11, suitably mounted upon supports J00111.13 provided with a gate-valve 111. The

expansion chamber 11 may, have supplied thereto a suitable heating fluid, such as heated air, which may enter through a conbe used for the duit 15 leading from a jacket 16 surrounding a heating urnace 17, air `being supplied to the jacket 16 under pressure, as by a blower 18. The outlet of the expansion chamber is shown as located in the top thereof and designatedV 19.v .Al suitable pressure gage-21 may be applied to the conduit 5, which leads lfrom the pump 4, to indicate the pressure within `this conduit and the heating coil 6. A pressure-gage 22 communicating with the heating chamber 7 may purpose of indicating the pressure, and therefore the temperature, within this chamber. Suitable regulation of the temperature within the heating chamber 7 may be accomplished by providing a r Specification of Letters Patent. Application filed July 8, 1915. Serial No. 38,670.

'chamber 11, is free In this specification 12 and having ,a hopper-bot.

`pansion chamber 11.

Patented Nov. 25, 1919.

controlling valve 23 on the 'steam-supply pipe 8.

As will-be seen the liquidin its passage' from the supply tank to the nozzle 10, from which it discharges into the expansion from air, thus rendering the process appllcable to the evaporation of many substances to which the continuedy contact with air while heating would be injurious, such', for instance, as the drying of converted starch solutions, solution of lactose or sugar of milk, fruit juices, and others whichmight be enumerated.

When using this apparatus for the carrying out of my invention, it will be. operated in the following manner: j

The solution, for instance, an aqueous sugar solution, will be placed within the supply tank 1. operated to Vwithdraw the solution from the tank 1, and force it under pressure throughthe conduit 5, heating coil l6, and out of the discharge-nozzle 10, the pressure being regulated by regulating the speed of the pump, or by any other well-known expedient. Steam, heating fluid will be supplied to the heating chamber 7 in `order to heat the moving stream, or fluid, within the heating coil 6. It will `be understood that the degree of heat and pressure made use of in the heating coil 6 will be dependent upon the nature the nozzlel 10 into the chamber 11, in which it will expand and become volatilized, the solid particlesl which are freed from the liquid by such volatilization falling to the hopper-bottom 13, in' which they collect and from which they maybe removed from time to time vthrough the gate-valve 14. In order to assist in the complete volatilization of the fluid issuing from the nozzle 10, it may be desirableto apply heat to the expansion chamber 11, and this may conveniently be effected by continuously supplying a stream of heated air, which is blown in by the Iblower 18 and over the furnace 17, and thence through the conduit 15 to the eX- The volatilized produ cts and the heated air will flow outward continuously through the conduit 19. The heat and pressure within the heating coil The pump L1 will then be so or other liquid or gaseous 6 may be accurately controlled by controlling the pump at, and the supply of heating fluid which enters through the pipe 8, in order to obtain the best results from the entire process. For some solutions it is found advisable to use high temperatures and pressure within the heatingl coil 6, the high pressure preventing, to a large extent, the volatilization of any of the liquid Within this coil or before its release from the nozzle l0. By-maintaining the same temperatures,A

but by decreasing the pressure within the heating coil 6, a considerable proportion, up to substantially the entire amount, of the liquid .may be volatilized within the coil, and the stream issuing from the nozzle l0 will bea mixture of vapor and finely divided liquid, or almost wholly vapor, depending upon the degree of heating and expansion within the coil and nozzle. The complete release of the pressure upon the liquid within the expansion chamber will, per se, act to volatilize any liquid constituents remaining in the discharging stream. Any additional heat needed to effect complete vaporization of the liquid and drying of the solid particles will, in the manner of carrying out the invention shown by the drawing, be supplied by the heated air entering through the conduit 15.

While I have described in detail one form of apparatus for carrying out my invention, and a specific manner in which the process of the invention may be performed with the and expanded vstreams are thoroughly mixed,

use of this apparatus, it is to be understood that such showing and description is illustrative only, and for the purpose of rendering clearer the principles of my invention, and that I do not regard my invention as limited to the specific steps or the use of the apparatus shown and described, except in so far as such limitations have been included within the terms of the following claim, in which it is my intention to claim all novelty inherent in my invention as broadly as possible, in view of the prior art.

What I claim as new and desire to secure by Letters Patent is* The herein described process of desiccating liquids which'consists of the steps of forcing the liquid alone under. pressure and.

free from air through acoil heated to a temperature above its boiling'point where it is partially volatilized, discharging the partially volatilized liquid from the end of said coil into an expansion chamber where the solid particles are collected, simultaneously supplying a stream of desiccating atmosphere to said chamber at an angle in opposed relation to the incoming stream4 of partially volatilized liquid whereby the and withdrawing the vapors and desiccating atmosphere from said chamber.

GEORGE ARTHUR RUHL. r

In presence of- D. C. THoRsEN,

O. C.Av1sUs. y 'i Q gli i 

